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巨噬细胞炎症消退需要 CPEB4 指导的 mRNA 降解偏移。

Macrophage inflammation resolution requires CPEB4-directed offsetting of mRNA degradation.

机构信息

Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Barcelona, Spain.

Universitat Pompeu Fabra, Barcelona, Spain.

出版信息

Elife. 2022 Apr 20;11:e75873. doi: 10.7554/eLife.75873.

Abstract

Chronic inflammation is a major cause of disease. Inflammation resolution is in part directed by the differential stability of mRNAs encoding pro-inflammatory and anti-inflammatory factors. In particular, tristetraprolin (TTP)-directed mRNA deadenylation destabilizes AU-rich element (ARE)-containing mRNAs. However, this mechanism alone cannot explain the variety of mRNA expression kinetics that are required to uncouple degradation of pro-inflammatory mRNAs from the sustained expression of anti-inflammatory mRNAs. Here, we show that the RNA-binding protein CPEB4 acts in an opposing manner to TTP in macrophages: it helps to stabilize anti-inflammatory transcripts harboring cytoplasmic polyadenylation elements (CPEs) and AREs in their 3'-UTRs, and it is required for the resolution of the lipopolysaccharide (LPS)-triggered inflammatory response. Coordination of CPEB4 and TTP activities is sequentially regulated through MAPK signaling. Accordingly, CPEB4 depletion in macrophages impairs inflammation resolution in an LPS-induced sepsis model. We propose that the counterbalancing actions of CPEB4 and TTP, as well as the distribution of CPEs and AREs in their target mRNAs, define transcript-specific decay patterns required for inflammation resolution. Thus, these two opposing mechanisms provide a fine-tuning control of inflammatory transcript destabilization while maintaining the expression of the negative feedback loops required for efficient inflammation resolution; disruption of this balance can lead to disease.

摘要

慢性炎症是疾病的主要原因。炎症反应的部分调节是通过编码促炎和抗炎因子的 mRNA 的不同稳定性来实现的。特别是,tristetraprolin(TTP)指导的 mRNA 去腺苷酸化使富含 AU 元件(ARE)的 mRNA 不稳定。然而,这种机制本身并不能解释为了使促炎 mRNA 的降解与抗炎 mRNA 的持续表达解偶联,所需的各种 mRNA 表达动力学。在这里,我们表明 RNA 结合蛋白 CPEB4 在巨噬细胞中与 TTP 以相反的方式发挥作用:它有助于稳定在其 3'-UTR 中含有细胞质多聚腺苷酸化元件(CPE)和 ARE 的抗炎转录本,并且它是脂多糖(LPS)触发的炎症反应消退所必需的。CPEB4 和 TTP 活性的协调通过 MAPK 信号通路进行顺序调节。因此,巨噬细胞中 CPEB4 的耗竭会损害 LPS 诱导的败血症模型中的炎症消退。我们提出,CPEB4 和 TTP 的拮抗作用,以及 CPE 和 ARE 在其靶 mRNA 中的分布,定义了炎症消退所需的转录特异性衰减模式。因此,这两种相反的机制提供了对炎症转录本不稳定的精细调节,同时维持了有效炎症消退所需的负反馈回路的表达;这种平衡的破坏可能导致疾病。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f57e/9094754/1d854aeea2bf/elife-75873-fig1.jpg

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